KR0176532B1 - Reel operating device of vcr - Google Patents

Abstract

The reel table driving apparatus of the tape recorder of the present invention includes a main plate; A reel disk rotatably installed on the main plate, a drive gear which is coaxially coupled with the reel disc to transfer the driving force to the reel disc, and has a diameter larger than that of the drive gear, and has a larger diameter than that of the reel disc. A reel table including a friction gear for transmitting; A first intermediate gear selectively engaged with or separated from the friction gear; A second intermediate gear selectively engaged with or separated from the drive gear; Lifting means for elevating the first intermediate gear so that the first intermediate gear meshes with the friction gear in the low speed mode, and separates the friction gear in the high speed mode; And a first idler gear corresponding to the first intermediate gear, and a second idler gear coaxial with the first idler gear, the second idler gear having a larger diameter than the first idler gear and corresponding to the second intermediate gear. An idler means operable to engage the first idler gear with the first intermediate gear, and in the high speed mode the second idler gear to engage the second intermediate gear; It is characterized by including.

Description

Reel Drive of Tape Recorder

1 is a perspective view of a reel table driving apparatus of a conventional tape recorder.

2 is a partial cross-sectional view of the device of FIG.

3 is an exploded perspective view of a reel table of a reel table driving apparatus of a tape recorder according to the present invention.

4 is a perspective view of a reel table driving apparatus of a tape recorder according to the present invention.

5 is a partial perspective view showing a PLAY / REV mode state of a reel table driving apparatus of a tape recorder according to the present invention.

6 shows a REW / F.F. Of a reel table driving apparatus of a tape recorder according to the present invention. Partial perspective view showing the mode state.

7 is a perspective view of a reel table driving apparatus of a tape recorder according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

31: drive gear 32: bush shaft

33: reel disc 34: friction gear

35: disc pad 36: spring

38: spacer 41, 42: reel table

44: first intermediate gear 45: second intermediate gear

46: lever member 49: belt

56 plate member 60 brake member

100: main plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive of a tape recorder, and more particularly to a reel drive of a tape recorder for selectively transferring power provided from a drive source to a supply reel table and a reel table.

In the magnetic recording and reproducing apparatus, the tape wound on the supply reel and the reel of the tape cassette have different winding directions and winding speeds, respectively, depending on the linear motion mode. That is, in the PLAY / REV mode, the tape is wound relatively slowly, while the REW / F.F. In mode, the tape is wound at high speed. Conventionally, clutch means is mainly used as such speed switching means. This will be described with reference to FIGS. 1 and 2.

On the main plate 10, a supply reel table 11 and a receptacle table 12 on which a supply reel and a reel of a tape cassette (not shown) are respectively mounted are provided. Reel gears 13 and 14 which rotate in engagement with the intermediate gears 15 and 16 are provided below the two reel tables 11 and 12. Each of the intermediate gears 15 and 16 is selectively engaged with the first idle gear 17 in accordance with the normal and reverse directions of the tape travel direction. The first idler gear 17 rotates by receiving a driving force of a capstan motor (not shown), and pivots toward the intermediate gear 15 or 16 around the idler shaft 18 according to the rotational direction thereof.

The clutch means 20 is coupled to the idler shaft 18 below the main plate 10. The clutch means 20 includes a pulley 21 and a clutch wheel 23 connected to the capstan motor and the belt 22 to rotate. The clutch wheel 23 has a pad 24 on its upper surface which rubs against the lower surface of the pulley 21, and on the idler shaft 18 through a wheel shaft 23a having a hollow into which the idler shaft 18 is fitted. It is connected to the first drive gear 25 supported by the spring (26). The first drive gear 25 always rotates with the clutch wheel 23 and can slide in the axial direction of the idler shaft 18.

The second driving gear 27 is installed on the outer circumference of the first driving gear 25, for example, coupled by shrinkage and installed to rotate together with the first driving gear 25. It is supported by the locking projection 25a protruding from the bottom. An upper surface of the second driving gear 27 is provided with a pressure member 28 for pressing the second driving gear 27 and the first driving gear 25 downward in cooperation with a slider (not shown). The second driving gear 27 is slidable in the direction of the idler shaft 18 together with the first driving gear 25, and inserted into the locking groove 29 formed on the upper surface of the pulley 21, protruding downward. It has a locker 27a.

In the conventional reel table driving apparatus configured as described above, when the low speed mode such as PALY / REV is operated, the first driving gear 25 is engaged with the first idle gear 17 as shown in FIG. do. That is, the driving force of the capstan motor is sequentially transmitted to the belt 22, the pulley 21, the clutch wheel 23, the first driving gear 25 and the first idle gear 17, and then the first idle gear 17. Is transmitted to the reel table 11 or 12 via the intermediate gear 15 or 16 engaged with the.

In this case, the driving force of the capstan motor is transmitted to the first idle gear 17 having a large diameter by the pad 24 of the clutch wheel 23, or the reel table 11 engaged with the first idle gear 17 or the like. 12 is rotated at a low speed. Here, if an unexpected overload is applied to the reel tables 11 and 12, the rotation of the reel tables 11 and 12 is decelerated or stopped, and the intermediate gears 15 and 16 and the first idler gear 17 are rotated. When the first drive gear 25 and the clutch wheel 23 can no longer rotate, the pad 24 slides on the pulley 21 to prevent the tape from stretching and breaking.

On the contrary, in the high speed mode such as REW / F.F., The pressing member 28 presses the second driving gear 27 downward. Accordingly, the first driving gear 25 coupled with the second driving gear 27 also moves downward, so that the engagement between the first driving gear 25 and the first children gear 17 is broken, and the clutch wheel 23 ) Pad 24 drops from the bottom of pulley 21.

The second driving gear 27 is lowered to be engaged with the second idler gear 19 which is integrally coupled with the first idler gear 17 and has a diameter smaller than that of the first idler gear 17. At this time, the locker 27a of the second driving gear 27 is inserted into the locking groove 29 on the pulley 21. Accordingly, the driving force of the capstan motor is the reel table through the belt 22, the pulley 21, the locker 27a, the second driving gear 27, the second idle gear 19, and the intermediate gear 15, 16. Delivered to (11) or (12).

In this case, since the driving force of the capstan motor is transmitted to the second idle gear 19 having a small diameter, the reel tables 11 and 12 rotate at high speed.

However, in the conventional reel table driving device as described above, since the clutch means is coupled to the lower part of the main plate, it is an obstacle in reducing the thickness of the device. Wear of the second drive gear occurs, the rotation is not stable.

In addition, sometimes the locker does not come out of the locking groove at the time of mode switching, and the tape is damaged by excessive tension on the cassette tape.

Accordingly, the present invention has been made in view of the above-described points, and the reel table driving of the tape recorder can be provided with a clutch means in the reel table to overcome the height limitation of the apparatus and to prevent excessive tension on the tape. To provide a device.

Reel table driving apparatus of the tape recorder according to the present invention for achieving the above object, the main plate; A reel disk rotatably installed on the main plate, a drive gear coupled coaxially with the reel disk to transmit a driving force to the reel disk, and frictionally coupled with the drive gear having a larger diameter than the drive gear. A reel table including a friction gear for transmitting a driving force to the reel disk; A first intermediate gear selectively engaged with or separated from the friction gear; A second intermediate gear selectively engaged with or separated from the drive gear; Lifting means for elevating the first intermediate gear so that the first intermediate gear meshes with the friction gear in the low speed mode, and separates the friction gear in the high speed mode; And a first idler gear corresponding to the first intermediate gear, and a second idler gear coaxially with the first idler gear and having a larger diameter than the first idler gear and corresponding to the second intermediate gear. And an idler means operable to engage the first idler gear with the first intermediate gear in the low speed mode, and engage the second idler gear with the second intermediate gear in the high speed mode; It is characterized by including.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

Referring to FIG. 3, the reel table of the reel table driving apparatus of the tape recorder according to the present invention includes a drive gear 31 having a hollow bush shaft 32, wherein At the end, a rib 32a is coupled to a rib groove (not shown) of the inner circumference of the reel disk 33. A friction gear 34 having a larger diameter than the drive gear 31 is rotatably inserted into the bush shaft 32 between the drive gear 31 and the reel disk 33, and the friction gear 34 and the drive gear ( 31, the disk pad 35 which is a friction member is interposed.

A spring 36 biasing the friction gear 34 toward the drive gear 31 is interposed between the reel disk 33 and the friction gear 34. Preferably, a washer 37 is interposed between the spring 36 and the friction gear 34, and a spacer 38 is interposed between the friction gear 34 and the drive gear 31.

In the above configuration, the drive gear 31 and the reel disk 33 are always rotated together because they are coupled by the ribs 32a, but the friction gear 34 is always rotated through the disc pad 35 so that the drive gear ( 31) and reel disc 33 does not rotate.

Referring to FIG. 4, the reel table 41 and 42 having the above configuration are rotatably installed on the shafts 43a and 43b fixed to the main plate 100. A supply reel and a winding reel of a cassette (not shown) are respectively mounted on the reel tables 41 and 42.

The friction gear 34 of the reel tape 41 and 42 is transmitted and driven by a pair of first intermediary gears 44 which are selectively engaged with or separated from the friction gear 34 while being raised and lowered. The first intermediate gear 44 is lifted by the lifting means, and the lifting means is formed with an inclined slot 46a to which the shaft 44a of the first intermediate gear 44 is coupled and has a protrusion 46b. It includes a lever member 46 and the elastic means (44b) above the first intermediate gear 44. As shown, a spring may be provided as the elastic means (44b). The protrusion 46b (see FIG. 5) is formed on the bottom surface of the lever member 46 so as to slide in the slot 51a of the slider 51, and the lever member 46 is in the A direction of the slider 51. The movement is reciprocated at right angles to the movement direction A by the movement.

The drive gear 31 of the reel tables 41 and 42 is always engaged with the second intermediate gear 45 to receive the driving force of a drive motor such as a capstan motor (not shown).

The first and second intermediary gears 44 and 45 are selectively engaged with idle gears 47a and 47b which pivot about an idler shaft 48a according to the tape travel direction (forward or backward). . The idle gears 47a and 47b are driven by a pulley 48 and a pulley gear 48b on the bottom surface of the main plate 100 coupled to the idler shaft 48a. The pulley 48 is a belt 49. Is connected to the driving motor. Here, as shown, the diameter of the idle gear 47a is smaller than the diameter of the idle gear 47b.

An operation of the reel table driving apparatus of the tape recorder according to the present invention will be described with reference to FIGS.

As shown in FIG. 4, the state of the reel table drive device in the REV mode in which the pulley 48 rotates in the B direction is shown in FIG. As the pulley 48 rotates in the B direction, the idle gear 47a pivots about the idler shaft 48a to be engaged with the first intermediate gear 44. Since the first intermediate gear 44 is elastically supported by the elastic means 44b on the upper side thereof and is engaged with the friction gear 34, all of the driving force transmitted from the idle gear 47a is transferred to the friction gear 34. To pass. When the friction gear 34 rotates, the drive gear 31 is also rotated by the disk pad (FIG. 35) below it, so that the reel disk 33 coupled with the drive gear 31 rotates. . At this time, the second intermediate gear 45 coupled to the drive gear 31 rotates according to the rotation of the drive gear 31 in a state in which no load is applied.

Therefore, since the reduction ratio becomes large while the driving force is transmitted through the idle gear 47a, the first intermediate gear 44, and the friction gear 34, the reel disk 33 rotates at a low speed.

If the reel disk 33 is unexpectedly overloaded and the reel disk 33 is decelerated or stopped, the drive gear 31 integrally coupled thereto is stopped, but is contacted by the disk pad 35. The friction gear 34 which can be rotated continuously can prevent the tape from sagging or breaking the tape.

In the PLAY mode, the pulley 48 moves in the opposite direction of the B direction, and the idle gear 47a is coupled to the first intermediate gear 44 on the receiving reel table 42 side, and the first intermediate gear 44 is accommodated. In reversing the running direction of the tape by engaging the friction gear 34 of the reel table 42, it is distinguished from that in the REV mode, and the operation is the same.

On the other hand, in the REW mode, the state of the reel table drive device of the present invention is shown in FIG. When the selection mode is switched to REW, the slider 51 moves linearly in the A direction and the lever member 46 slides while the projection 46b of the lever member 46 slides in the slot 51a of the slider 51. Like the arrow direction C, the slider 51 moves at right angles to the movement direction of the slider 51. Therefore, since the lever member 46 moves toward the first intermediate gear 44 elastically supported by the spring 44a, the first intermediate gear 44 is inclined slot ( It rises along 46a) and is separated from the friction gear 34. At this time, the idle gear 47b is pivoted about the idler shaft 48a to be engaged with the second intermediate gear 45. Since the second intermediate gear 45 is always engaged with the drive gear 31 of the reel table 41, the driving force of the drive motor is driven through the pulley 48, the idle gear 47b, and the second intermediate gear 45. It is transmitted to the gear 31. In addition, the reel disk 33 integrally coupled with the drive gear 31 also rotates. In this state, the driving force is transmitted to the reel disk 33 through the idle gear 47b, the second intermediate gear 45, and the drive gear 31, so that the reel disk 33 is relatively faster than the REV mode. Rotate

F. In F mode, the pulley 48 moves in the opposite direction of the B direction, and the idle gear 47b is coupled to the second intermediate gear 45 on the receiving reel table 42 side, and the second intermediate gear 45 Is different from that in the REW mode in that it is coupled to the drive gear 31 of the receptacle table 42 to reverse the running direction of the tape, and the operation is the same.

According to FIG. 4, a brake member 60 may be installed on the bottom surface of the reel table 41 and 42 to adjust the speed or maintain the tension of the tape when the reel table rotates.

A reel table driving apparatus of a tape recorder according to another embodiment of the present invention is described with reference to FIG.

As shown, the first intermediate gear 44 is coupled to the plate member 56. In this embodiment, the plate member 56 can be moved in the D direction by the projection (FIG. 6B 46b) which moves along the slot 51a in accordance with the movement of the slider 51 in the A direction.

In the PLAY / REV mode, the idle gear 47a meshes with the first intermediate gear 44 to transmit the driving force to the reel disk 33 via the friction gear 34.

REW / F.F. In the mode, the plate member 56 is moved in the D direction by the linear movement of the slider 51, so that the first intermediate gear 44 fixed to the plate member 56 is engaged with the friction gear 34. By exiting the gear 47a, the engagement with them is separated. The idle gear 47 is pivoted to be engaged with the second intermediate gear 45 as described above, and the driving force is transmitted to the driving gear 31 engaged with the second intermediate gear 45.

As described above, in the reel table driving apparatus of the tape recorder according to the present invention, by providing the clutch means on the reel table, it is easy to slim down the apparatus, and a separate pressing member for supporting the intermediate gear is unnecessary. In addition, since the locker and the locking groove are not included, damage to the tape due to the malfunction can be fundamentally solved.

Claims (6)

Main plate; A reel disk rotatably installed on the main plate, a drive gear coupled coaxially with the reel disk to transmit a driving force to the reel disk, and frictionally coupled with the drive gear having a larger diameter than the drive gear. A reel table including a friction gear for transmitting a driving force to the reel disk; A first intermediate gear selectively engaged with or separated from the friction gear; A second intermediate gear meshing with the drive gear; Lifting means for elevating the first intermediate gear so that the first intermediate gear meshes with the friction gear in the low speed mode, and separates the friction gear in the high speed mode; And a first idler gear corresponding to the first intermediate gear, and a second idler gear coaxially with the first idler gear and having a larger diameter than the first idler gear and corresponding to the second intermediate gear. And an idler means operable to engage the first idler gear with the first intermediate gear in the low speed mode, and engage the second idler gear with the second intermediate gear in the high speed mode; Reel table driving apparatus of a tape recorder, characterized in that it comprises. The reel table of claim 1, further comprising: a disc pad fitted between the friction gear and the drive gear; And a first spring interposed between the reel disk and the friction gear to elastically bias the friction gear and the disk pad toward the drive gear. According to claim 1, The lifting means is provided on the main plate slider for linear movement according to the mode conversion operation; And a lever member which moves toward the first intermediate gear or moves away from the first intermediate gear according to the movement of the slider to move the first intermediate gear up and down. According to claim 3, The slider is formed with a slot in a direction intersecting the direction of movement, one surface of the lever member is formed with a projection to move along the slot, the rotating shaft of the first intermediate gear A second spring for elastically biasing the first intermediary gear is provided, and an inclined slot is formed at the end of the lever member to engage with the rotation shaft of the first intermediary gear. And the first intermediary gear is raised and lowered. According to claim 1, The lifting means is provided on the main plate slider for linear movement according to the mode conversion operation; And a plate member reciprocating according to a linear movement of a slider to connect or separate the first intermediate gear from the friction gear. The method of claim 5, wherein the slider is formed with a slot in a direction crossing the direction of movement, one surface of the plate member is formed with a projection to move along the slot, the end of the plate member is the first An intermediary gear is rotatably installed so that the first intermediate gear is moved in a direction orthogonal to the slider.